For a PP/PE film washing project, define the incoming waste and the material required by the next processor before comparing line quotations. A useful specification states polymer composition, film condition, contamination and the agreed output checks. A capacity label without those conditions does not tell you how much acceptable recycled material a line will deliver.
Jiangsu ASG Packaging Machinery Group lists friction washing, screw-press dewatering and a pelletizing line for PP/PE film regrind from a washing line. These are different process stages. Their catalogue descriptions help identify equipment to assess; they do not establish that every film stream needs the same configuration or that a washing quotation includes pelletizing.
Source: ASG friction screw washer
Source: ASG screw-press dewatering machine
Source: ASG PP/PE film regrind pelletizing line
Describe the film stream, not just the polymer name
State whether the material is production scrap, collected packaging, agricultural film or another identified stream. Provide the known PP and PE composition and identify multilayer structures, printing, labels and other plastics where present. Send photographs, dimensions, storage condition and representative samples. A clean offcut and a dirty collected film should not be treated as the same quotation basis.
Describe how the material arrives: loose, baled, already shredded or wet. Ask which opening, sorting, cutting and feeding operations are included. Record the conditions the supplier has assessed and keep untested material types outside the agreed acceptance scope until reviewed.
List contamination and define the washing task
Identify soil, sand, paper, adhesive, oil or product residues actually found in your samples. Ask which proposed stages address each contaminant and which materials must be removed before feeding. ASG describes its friction screw washer as a water-assisted scrubbing stage. This description does not justify assuming that one washer will remove every coating, ink, adhesive or mixed polymer.
Request a process diagram showing the selected washing and separation stages, material transfers and reject outlets. Ask the supplier to explain any proposed hot washing or additional treatment against your actual contamination, rather than adding equipment solely because another installation uses it.
Specify the handover after dewatering
ASG describes screw-press dewatering as mechanically squeezing water from wet plastic. The next stage still needs a defined receiving condition. Agree where samples will be taken, how moisture will be measured and which material form the downstream feeder requires. Record any further drying or material preparation in the scope, with the responsible supplier identified.
If pelletizing is planned, ask the proposed pelletizer supplier to assess representative washed material. Agree acceptable moisture, residual contamination and feeding conditions in writing. Do not assume that a clean-looking or squeezed sample is ready for every extruder, or that a washing-line proposal guarantees the properties of finished pellets.
Compare output using a shared measurement basis
Ask whether incoming and outgoing mass figures include water and contaminants, and how accepted output and rejected material are recorded. Define the weighing points and sample condition. Comparing wet incoming material with dry accepted output without an agreed basis can make two proposals appear equivalent when their measurement boundaries differ.
For a proposed trial, record the feedstock batch, operating conditions, test duration, included equipment and output checks. Ask how stops, screen cleaning, material variation and waste removal will be documented. Request application-specific results rather than interpreting a catalogue capacity as a commitment for your mixed waste stream.
Include the water and waste interfaces
Mark fresh-water supply, recirculation, discharge, solids collection and any treatment equipment on the proposal. Ask what is included, what the factory must supply and what information is needed to assess the wastewater and residue handling. Establish maintenance access and cleaning responsibilities. A complete washing proposal needs clear interfaces as well as a list of machines.
Send a quotation package with clear acceptance checks
- Feedstock: origin, known polymer composition, film formats, contamination, delivery condition, photographs and representative samples.
- Output: required material form, intended next process, agreed sampling point and moisture and contamination assessment methods.
- Process scope: included sorting, cutting, washing, separation, dewatering, additional drying and downstream equipment, with exclusions marked.
- Factory interfaces: layout, available utilities, water circulation, wastewater and solids handling, storage and maintenance access.
- Acceptance: agreed feedstock batch, operating conditions, measurement basis, test responsibilities and documentation.
Send ASG the input samples and required downstream conditions together. Request a process proposal that explains the handover between stages and leaves unresolved material or quality questions visible until assessed.